CN210325378U - Insulating sleeve reaches looped netowrk cabinet including it - Google Patents
Insulating sleeve reaches looped netowrk cabinet including it Download PDFInfo
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- CN210325378U CN210325378U CN201920815195.3U CN201920815195U CN210325378U CN 210325378 U CN210325378 U CN 210325378U CN 201920815195 U CN201920815195 U CN 201920815195U CN 210325378 U CN210325378 U CN 210325378U
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Abstract
The utility model discloses an insulation support and looped netowrk cabinet including it. The insulating sleeve defines a longitudinal axis and includes: an inner surface, an outer surface, a first end and a second end, wherein the inner surface defines a hollow lumen, is arranged coaxially with the main body, and is used for connecting the high-voltage conductor, the outer surface gradually increases in size from the first end and the second end to the middle part and has a maximum size, a size narrowing part is arranged in the middle part, the maximum size is jointed with the end part of the size narrowing part by an abrupt step part, and the step part defines an annular plane in the direction perpendicular to the axial line and is used for jointing with the mounting surface of the insulating sleeve; wherein an annular groove is provided at an end of the size narrowing portion, which is engaged with the stepped portion, for uniform electric field distribution of the inner and outer surfaces. The utility model discloses an insulation support is through setting up the recess and shortening the semiconductor coating of hollow tube intracavity in step portion department, under the condition that does not basically change insulation support's cost, is showing and is improving insulation support's insulating properties.
Description
Technical Field
The present invention relates to an insulation bushing, and more particularly, to an insulation bushing with improved insulation performance. The utility model discloses still relate to the looped netowrk cabinet including it.
Background
Complete set distribution equipment usually needs the cabinet combination to be connected, and the cabinet combination is connected and need be carried out high voltage conductor electricity between two cabinets and be connected, and high voltage conductor needs to carry out electrical insulation with the cabinet body, consequently need use insulation support to carry out the electrical connection between the high voltage conductor and the electrical insulation between the high voltage conductor and the cabinet body when carrying out the cabinet combination and connect.
With the improvement of the environmental protection requirement of people, environmental protection insulating media or air with poor insulating property are mostly adopted in power distribution equipment, so that the insulating property of the insulating sleeve is required to be further improved to meet the insulating requirement under the condition of the environmental protection insulating media or the air, and meanwhile, the cost of the insulating sleeve cannot be obviously increased due to the cost requirement of a product.
There is therefore a need for an improved insulating bushing and ring main unit comprising the same.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an improved insulation support and looped netowrk cabinet including it.
According to an aspect of the present invention, there is provided an insulation sleeve, characterized in that, a longitudinal axis is defined, including:
an inner surface, an outer surface, a first end and a second end,
wherein the inner surface defines a hollow lumen, arranged coaxially with the main body, for connection to a high voltage conductor,
wherein the outer surface is progressively larger in size from the first and second ends towards the central portion and has a maximum size with a reduced size portion in the central portion, the maximum size engaging with an end of the reduced size portion with an abrupt step defining an annular plane in a direction perpendicular to the axis for engaging with the mounting surface of the insulating sleeve;
wherein an annular groove is provided at an end of the size narrowing portion, which is engaged with the stepped portion, for uniformizing electric field distribution of the inner and outer surfaces.
Preferably, the inner surface of the insulating sleeve is coated with a semiconducting layer, which extends over a middle portion of the inner surface, the edges of which are spaced an equal distance from the first end or the second end, respectively, for increasing the creepage distance.
Preferably, the insulation sleeve outer surface is formed in a tapered shape with a decreasing diameter from the first end and the second end towards the middle.
Preferably, the outer wall surface portion of the insulating sleeve between the abrupt steps is also coated with the semiconductor layer.
Preferably, the bottom of the groove is rounded.
Preferably, the fillet radius is about 2mm, the groove depth is about 2mm, and the groove width is about 10 mm.
Preferably, the middle of the insulating sleeve is further provided with an annular protrusion for holding the grounding element.
Preferably, the insulating sleeve body is silicone rubber.
Preferably, the hollow lumen includes a middle portion having a constant size and two end portions on both sides of the middle portion, the two end portions having sizes gradually increasing from the middle portion toward the first and second ends.
According to the utility model discloses an on the other hand provides a looped netowrk cabinet, is provided with the cabinet-combining sleeve pipe at the lateral part for it is preceding to receive insulating sleeve.
According to the utility model discloses an embodiment reduces the electric field of step portion department through set up the recess between insulation support's diameter sudden change step portion and its adjacent part to even electric field then improves insulation support's creepage distance through the semiconductor layer that sets up marginal distance insulation support tip certain distance in the middle part of the cavity lumen, under the condition that does not change insulation support's cost basically, is showing and is improving insulation support's insulating properties.
Drawings
Fig. 1 is a cross-sectional view along a longitudinal axis of an embodiment of an insulation sleeve according to the present invention;
fig. 2 is a cross-sectional view of the insulating sleeve shown in fig. 1 fitted between two cabinets and connecting high-voltage conductors.
Detailed Description
Embodiments according to the present invention will be described with reference to the accompanying drawings, wherein directional terminology used in the description is for the purpose of description only and is not intended to be limiting.
Fig. 1 is a cross-sectional view along a longitudinal axis of an embodiment of an insulation sleeve according to the present invention. In the figures, the insulating sleeve is generally indicated with reference number 1, the insulating sleeve 1 comprising a main body 11, a hollow lumen 16, a first end 12 and a second end 13, the hollow lumen 16 being arranged coaxially with the main body 11, defining a longitudinal axis, and the hollow lumen 16 and the main body 11 being rotationally symmetrical about the longitudinal axis. The inner surface of the main body 11 defines a hollow lumen 16, the hollow lumen 16 being for connection to a high voltage conductor.
The inner and outer surfaces of the body 11 are in the form of concentric circles of different diameters in cross-section perpendicular to the longitudinal axis, the outer surface including at least one abrupt step 15 of diameter, the step 15 defining an annular plane in the direction perpendicular to the axis for engagement with the mounting surface of the insulating sleeve. A groove 14 is provided between the step 15 and the adjacent portion, and the groove 14 functions to uniform the electric field distribution of the inner and outer surfaces.
In order to hold the insulating bushing 1 on the cabinet of the electrical distribution apparatus, it is generally unavoidable to use an abrupt diameter step, such as the step 15 in fig. 1. And tends to cause an increase in electric field at the diameter stepped portion 15 at a high voltage, thereby becoming a weak point of insulation. The utility model discloses an add recess 14 between sudden change step portion 15 and its adjacent part, can reduce the electric field of step portion 15 department to it is even to make electric field distribution, improves insulation support's insulating properties from this.
It can also be seen from fig. 1 that the inner surface of the body 11 is coated with a semiconductor layer 17, represented by a checkered pattern. It can be clearly seen that the semiconducting layer 17 is only located in the middle of the hollow tube 16, and each edge of the semiconducting layer 17 is at a distance 18 from the respective first end 12 or second end 13, which distance increases the creepage distance of the bushing 1 and thus the resistance of the bushing 1 to breakdown and discharge.
According to the utility model discloses an insulation support 1 is not only about axis rotational symmetry, but also about the central line bilateral symmetry perpendicular to the axis. Therefore, the diameter stepped portion 15 of the insulating sleeve 1 is two, and each diameter stepped portion 15 forms a tapered shape with a diameter reduced to the adjacent first end portion 12 or second end portion 13.
Although it is shown that the abrupt diameter step portions 15 each form a tapered shape with a gradually decreasing diameter to the adjacent first end portion 12 or second end portion 13, the present invention is not limited thereto, for example, two step portions 15 thereof may be a diameter-constant diameter-increasing portion including two step portions 15 located at the middle of the insulation sleeve 1, and the diameter from each step portion 15 to the corresponding first end portion 12 or second end portion 13 is also constant but smaller than the diameter of the diameter-increasing portion. Insulating sleeves having any shape that can be retained to the diameter step between two switch boards are within the scope of the present invention. The utility model discloses a set up the thought of recess in order to reduce the electric field of step portion between step portion and adjacent part is equally applicable.
The outer surface portion between the two diameter step portions 15 is also coated with a semiconductive layer, which can improve the insulating properties of the insulating sleeve.
The bottom of the groove 14 is a fillet, the radius of the fillet is 2mm in the embodiment, the depth of the groove is 2mm, the width of the groove is 10mm, the utility model discloses do not receive the restriction of these sizes, other suitable sizes are feasible, also the utility model discloses an within range.
In the present embodiment, each edge of the semiconductor layer 17 in the hollow tube 16 is 13mm away from the corresponding first end or second end, and the present invention is not limited by these dimensions, and other suitable dimensions are possible and are within the scope of the present invention.
The main body of the insulating sleeve 1 is silicon rubber, and insulating sleeves made of other insulating materials are also feasible and are also in the scope of the utility model.
The hollow lumen 16 includes a middle portion having a constant diameter and two end portions on both sides of the middle portion, the diameters of the two end portions gradually increasing from the middle portion toward the first and second ends. The shape of the hollow lumen 16 is also not limited to the above, and may be any shape as needed.
The middle part of the insulating sleeve 1 can also be provided with a grounding spring holding part for installing a grounding spring 8 (see fig. 2) to ensure that the insulating sleeve 1 is reliably grounded.
Fig. 2 is a cross-sectional view of the insulating sleeve shown in fig. 1 fitted between two cabinets and connecting high-voltage conductors. As can be seen from fig. 2, a cabinet combining sleeve 4 is disposed on the cabinet 3 of the power distribution equipment, a sealing member 6 is disposed on the cabinet combining sleeve 4 located inside the cabinet 3, a thread is disposed on the side extending out of the cabinet 3, the cabinet combining sleeve 4 is retained on the cabinet 3 by the thread and the fixing nut 5, and the sealing member 6 presses against the inner side surface of the cabinet 3 to form a seal after the cabinet combining sleeve 4 is retained on the cabinet 3. In practical operation, the insulating sleeve 1 is first inserted into the cabinet combining sleeve 4 between the cabinets 3 of the two power distribution devices from the outside of the cabinet 3, and is respectively pressed and jointed with the inner surfaces of the cabinet combining sleeves 4 of the cabinets 3 through the diameter step parts, and then the other end of the insulating sleeve 1 is inserted into the cabinet combining sleeve 4 of the other cabinet 3 by making the two cabinets 3 approach each other, and after the cabinets 3 are in place, the installation is completed. Since the insulating sleeve 1 in this embodiment is tapered in diameter from the abrupt diameter step to the corresponding end, the insulating sleeve 1 can be inserted from the outside into a cabinet combining sleeve on the side of the cabinet 3 of the power distribution apparatus, and thus held on the cabinet 3.
The cabinet matching bushing 4 is also made of an insulating material, the high-voltage conductors 2 extend into the cabinet matching bushing 4 from the end of the cabinet matching bushing 4 located inside the cabinet body 3, and are molded together with the cabinet matching bushing 4, and as can be seen from fig. 2, the high-voltage conductors 2 extend into the bushing from the corresponding first end or second end of the insulating bushing 1 toward the middle of the insulating bushing 1 from inside the cabinet body of each distribution equipment, and are connected by a metal connecting piece 7 arranged in the middle of the insulating bushing 1, so that the cabinet bodies of the distribution equipment are electrically connected. The metal connecting piece 7 is a metal reed type fastener which can be tightly and reliably connected with the high-voltage conductor 2 when the high-voltage conductor 2 extends into the metal reed type fastener, so that the conductive connection is realized. Therefore, according to the utility model discloses an embodiment reduces the electric field of set inside and outside through set up the recess between insulation support's diameter sudden change step portion and its adjacent part to even electric field, then improve insulation support's creepage distance through set up the semiconductor layer of marginal distance insulation support tip certain distance in cavity lumen middle part, under the condition that does not basically change insulation support's cost, show to have improved insulation support's insulating properties. According to the utility model discloses an insulation support can bear 1 minute 68 kV's power frequency withstand voltage, thunder and lightning 131 kV's lightning impulse withstand voltage. And the insulating sleeve with the same size and shape can only bear the power frequency withstand voltage of 50kV for 1 minute under the condition that the groove is not arranged and the semiconductor layer is arranged in the hollow pipe cavity.
The distribution equipment may be an electrical switchgear, preferably a ring main unit.
While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.
Claims (10)
1. An insulation bushing, defining a longitudinal axis, comprising:
an inner surface, an outer surface, a first end and a second end,
wherein the inner surface defines a hollow lumen, arranged coaxially with the main body, for connection to a high voltage conductor,
wherein the outer surface is progressively larger in size from the first and second ends towards the central portion and has a maximum size with a reduced size portion in the central portion, the maximum size engaging with an end of the reduced size portion with an abrupt step defining an annular plane in a direction perpendicular to the axis for engaging with the mounting surface of the insulating sleeve;
wherein an annular groove is provided at an end of the size narrowing portion, which is engaged with the stepped portion, for uniformizing electric field distribution of the inner and outer surfaces.
2. An insulation bushing according to claim 1, characterized in that the inner surface is coated with a semiconducting layer, which extends over a middle part of the inner surface with its edges spaced an equal distance from the first end or the second end, respectively, for increasing the creepage distance.
3. The insulating sleeve of claim 1 wherein the outer surface is tapered with a diameter from the first end and the second end toward the middle.
4. An insulating sleeve according to claim 3, characterized in that the outer wall surface portions between the abrupt steps are also coated with the semiconducting layer.
5. The bushing of claim 3 wherein the groove bottom is rounded.
6. The insulating sleeve of claim 5, wherein the fillet radius is about 2mm, the groove depth is about 2mm, and the groove width is about 10 mm.
7. An insulation bushing according to any of claims 1-3, characterized in that the insulation bushing middle is further provided with an annular protrusion for holding a grounding element.
8. An insulating sleeve according to any one of claims 1-3, characterized in that the insulating sleeve body is silicone rubber.
9. The insulating sleeve according to any one of claims 1 to 3, wherein the hollow lumen comprises a central portion of constant size and two end portions on either side of the central portion, the two end portions increasing in size from the central portion towards the first and second ends.
10. Ring main unit provided with a cabinet combining bushing at the side for receiving an insulation bushing according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920815195.3U CN210325378U (en) | 2019-05-31 | 2019-05-31 | Insulating sleeve reaches looped netowrk cabinet including it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920815195.3U CN210325378U (en) | 2019-05-31 | 2019-05-31 | Insulating sleeve reaches looped netowrk cabinet including it |
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| Publication Number | Publication Date |
|---|---|
| CN210325378U true CN210325378U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920815195.3U Active CN210325378U (en) | 2019-05-31 | 2019-05-31 | Insulating sleeve reaches looped netowrk cabinet including it |
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| CN (1) | CN210325378U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112448189A (en) * | 2020-11-25 | 2021-03-05 | 上海平高天灵开关有限公司 | Connector structure for ring main unit |
-
2019
- 2019-05-31 CN CN201920815195.3U patent/CN210325378U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112448189A (en) * | 2020-11-25 | 2021-03-05 | 上海平高天灵开关有限公司 | Connector structure for ring main unit |
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